Bluntness and incidence effects in hypersonic flows with large separated regions

This paper describes a numerical investigation on the effects of small to large bluntness as well as the angle of incidence on the leading-edge separation in a laminar hypersonic flow. The results show that both bluntness and incidence strongly influence separation characteristics. A combined bluntn...

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Bibliographic Details
Published inJournal of fluid mechanics Vol. 947
Main Authors Khraibut, A., Gai, S.L.
Format Journal Article
LanguageEnglish
Published Cambridge, UK Cambridge University Press 25.09.2022
Subjects
Entropy
Flow control
Geometry
Hypersonic flow
Incidence angle
JFM Papers
Laminar flow
Reynolds number
Separation
Shear stress
compressible boundary layers
hypersonic flow
boundary layer separation
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Summary:This paper describes a numerical investigation on the effects of small to large bluntness as well as the angle of incidence on the leading-edge separation in a laminar hypersonic flow. The results show that both bluntness and incidence strongly influence separation characteristics. A combined bluntness and incidence parameter is proposed and applied to plateau pressures in the separated region and is shown to demarcate effects of small and large bluntness at different angles of incidence. The investigation also showed profound changes in the internal structure of the separation bubble with changes in incidence and bluntness. The significance of the relationship between the two shear stress minima and the separation length is highlighted.
ISSN:0022-1120
1469-7645
DOI:10.1017/jfm.2022.605